Geez I thought everyone knew how to drive here.....:mug:
I attended Z06 Fest a couple years back and attended a driving seminar by Andy Pilgrim, he taught me how to sit in a car...
I'm 6'5" 245 lbs (just lost 40 lbs), seat is FORWARD about 2", very slightly reclined and no problem with a helmet. Before attending the seminar I ALWAYS put the seat back as far as possible in every car I drove. Here's your quick lesson: when your arms are on the steering wheel, they are supposed to be BENT!.....

This reduces fatigue and increases your ability to turn the wheel QUICKLY. Now, every car I get in I move the seat forward. If you don't believe me pick up a brick and hold it out with your arms extended and move it around like you do a steering wheel, they try it with your arms down and forearms extended.
Now do I need to educate you on how to adjust your side mirrors